That's the most informative piece I've seen on the internet yet.
Basically, they both look awful, and equally fluid. Conduit has those N64ish multiplayer levels with deliberate coloring and Treyarch's Call of Duty has those varied real-world-setting designs with poor coloring.
One thing I'm certain with Conduit is my controls are absolute magick. Treyarch's Call of Duty, the controls and gunplay I cannot judge without sitting with the control options for a half hour. I'm really not in the mood to purchase another Activision title, but I have very few options for sampling the game without going "YO GAMESTOP HOMIES, MIND IF WE TRY TREYARCH'S CALL OF DUTY ON THE DEMO WII KIOSK, YOU DIG ME?"